tools: take the data off the timerfd

Didn't really notice that as we just keep calling back indefinitely anyway but
the right thing to do here is to pull the 8 bytes off.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>
tap: disable logspam for tap state changes

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>